Perhaps you should try some spelling variations:
"modified multiobjective optimisation algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithm", "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective estimation algorithms"
"model using servo algorithm" » "model using search algorithm", "model using source algorithm", "code using servo algorithm", "models nursing servo algorithm", "powder using servo algorithm"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("model using servo algorithm") or ("modified multiobjective optimisation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("model using servo algorithm") OR ("modified multiobjective optimisation algorithm")).
• Removing quotes may allow a broader search: (( model using servo algorithm ) or ( modified multiobjective optimisation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("model using servo algorithm") or ("modified multiobjective optimisation algorithm"))*.